Key to the Oriental species of Teratomyza

1 First flagellomere large, discoid, slightly decumbent in some specimens, at least 1/3 is below the lower edge of pedicel in profile. Light markings on lateral edge of tergite 5 and 6 indistinct. Male genitalia (Figs 12–13, 21–27). Phallapodeme (Fig. 25) short, not much longer than its width. Female with spermathecae (Fig. 31) more pear shaped (length/width 0.075 * 0.055 mm), and entire surface covered by strong warts. Taiwan .......................................... T. formosana sp. nov.

- First flagellomere more round, only a small part is below the lower edge of pedicel in profile. Light markings on lateral edge of tergite 5 and 6 larger. Male genitalia (Figs 9–11, 14–20). Phallapodeme much longer than that of T. formosana (Fig. 16). Female with spermathecae (Fig. 29) rather globular (length/width 0.065 * 0.055 mm), warts distinct around base only. S China (Guangxi), Viet Nam ....................................................................... T. chinica Yang